This is the view I have and I can't scroll left or right, it's just stuck looking at this corner of the page. I can select emails and it tries to present them but as you can see it's in a tiny section. I couldn't find the option to switch to a mobile-friendly view on the website so perhaps it's related to that? My workaround is switch to desktop view from the browser options. Tested on different browsers (Chrome and FFox) and this has persisted on my last phone as well as my latest one.